package com.jijs.framework.util;

import org.apache.commons.lang.StringUtils;

/**
 * 中文转换为英文字母
 * 
 * @author jijs
 * 
 */
public class ChineseCharToEn {

	public final static char OTHER_CHAR = 'V';

	/**
	 * 
	 * @param args
	 */

	public static String getFristLetter(String strChinese) {
		String letter = getPYIndexStr(strChinese, true);
		if (StringUtils.isNotEmpty(letter)) {
			return StringUtils.substring(letter, 0, 1);
		}
		return null;
	}

	/**
	 * 
	 * 返回每个字的首字母
	 * 
	 * @param strChinese
	 * 
	 * @param bUpCase
	 * 
	 * @return
	 */

	private static String getPYIndexStr(String strChinese, boolean bUpCase) {

		if (strChinese == null) {
			return null;
		}

		try {

			StringBuffer buffer = new StringBuffer();

			byte b[] = strChinese.getBytes("GBK");// 把中文转化成byte数组

			for (int i = 0; i < b.length; i++) {

				if ((b[i] & 255) > 128) {

					int char1 = b[i++] & 255;

					char1 <<= 8;// 左移运算符用“<<”表示，是将运算符左边的对象，向左移动运算符右边指定的位数，并且在低位补零。其实，向左移n位，就相当于乘上2的n次方

					int chart = char1 + (b[i] & 255);

					buffer.append(getPYIndexChar((char) chart, bUpCase));

					continue;

				}

				char c = (char) b[i];

				/**
				 * 确定指定字符是否可以是 Java
				 * 
				 * 标识符中首字符以外的部分
				 */
				if (!Character.isJavaIdentifierPart(c)) {
					c = OTHER_CHAR;
				}

				buffer.append(c);

			}
			return buffer.toString().toUpperCase();

		} catch (Exception e) {

			System.out.println((new StringBuilder()).append("\u53D6\u4E2D\u6587\u62FC\u97F3\u6709\u9519")
					.append(e.getMessage()).toString());

		}

		return null;

	}

	/**
	 * 
	 * 得到首字母
	 * 
	 * @param strChinese
	 * 
	 * @param bUpCase
	 * 
	 * @return
	 */

	private static char getPYIndexChar(char strChinese, boolean bUpCase) {

		int charGBK = strChinese;

		char result;

		if (charGBK >= 45217 && charGBK <= 45252) {
			result = 'A';
		} else if (charGBK >= 45253 && charGBK <= 45760) {
			result = 'B';
		} else if (charGBK >= 45761 && charGBK <= 46317) {
			result = 'C';
		} else if (charGBK >= 46318 && charGBK <= 46825) {
			result = 'D';
		} else if (charGBK >= 46826 && charGBK <= 47009) {
			result = 'E';
		} else if (charGBK >= 47010 && charGBK <= 47296) {
			result = 'F';
		} else if (charGBK >= 47297 && charGBK <= 47613) {
			result = 'G';
		} else if (charGBK >= 47614 && charGBK <= 48118) {
			result = 'H';
		} else if (charGBK >= 48119 && charGBK <= 49061) {
			result = 'J';
		} else if (charGBK >= 49062 && charGBK <= 49323) {
			result = 'K';
		} else if (charGBK >= 49324 && charGBK <= 49895) {
			result = 'L';
		} else if (charGBK >= 49896 && charGBK <= 50370) {
			result = 'M';
		} else if (charGBK >= 50371 && charGBK <= 50613) {
			result = 'N';
		} else if (charGBK >= 50614 && charGBK <= 50621) {
			result = 'O';
		} else if (charGBK >= 50622 && charGBK <= 50905) {
			result = 'P';
		} else if (charGBK >= 50906 && charGBK <= 51386) {
			result = 'Q';
		} else if (charGBK >= 51387 && charGBK <= 51445) {
			result = 'R';
		} else if (charGBK >= 51446 && charGBK <= 52217) {
			result = 'S';
		} else if (charGBK >= 52218 && charGBK <= 52697) {
			result = 'T';
		} else if (charGBK >= 52698 && charGBK <= 52979) {
			result = 'W';
		} else if (charGBK >= 52980 && charGBK <= 53688) {
			result = 'X';
		} else if (charGBK >= 53689 && charGBK <= 54480) {
			result = 'Y';
		} else if (charGBK >= 54481 && charGBK <= 55289) {
			result = 'Z';
		} else {
			result = OTHER_CHAR;
		}

		if (!bUpCase) {
			result = Character.toLowerCase(result);
		}

		return result;

	}

}